I used to play with AFX/Tyco slot cars and have a decent collection - the older (late 70's early 80's) cars are the best, they just started to develop some speed but no traction magnets - the best HO slot car driving experience IMO.

A couple of years ago I bought an SCX track with a Subaru WRX & Mitsubishi EVO, the WRX stalls or shorts the power supply and they didn't fix it under warranty. Plus they both have so much magnetic traction that they are no fun I'm on the look out for more track and older cars, but can't find anything cheap enough - it's not my main hobby and I've only used the track a few times so has to be really cheap

Still good fun, especially when its raining and you can't take out the nitro beast.